RE: Problems with SPI and ADS8320

Try setting the spi delay to 1.  There is a bug with a Delay of 0 in the spi
of 1.12.

Let me know if you still see incorrect behavior.

Jeremy

> -----Original Message-----
> From: tini-admin-6tN4nzCoH/[email protected] [mailto:[email protected]]On Behalf Of
> Erio Magnoni
> Sent: Tuesday, February 03, 2004 9:28 AM
> To: tini-6tN4nzCoH/[email protected]
> Subject: [TINI]Problems with SPI and ADS8320
>
>
> Hi everyone!
> I'm using Tini 1.12 on a DS80C400 with an ADS8320 and I have some
> problems
> understanding the bits this ADC returns me. I use the xmit method
> of the SPI
> class to send 3 empty bytes of data and the ADC, as I see watching the
> oscilloscope, returnes digital data. I also see from the datasheet
> of the ADS8320 that timing is correct, as I have 5 clock edges for the
> sample&hold of the ADC and the 16 bit data following with MSB
> first. As the
> xmit method detail says, read data is returned in the same
> positions within
> the array, but I have some problems understanding the bits the
> ADC gives out.
> In fact on the oscilloscope I view different bits than the ones I
> print out on
> screen.
> Is my code incorrect? Can SPI library only execute 8-bit
> transfers? Do I have
> to modify it to execute 16-bit transfers as the ADS8320 is a
> 16-bit ADC? How
> can I do it?
> SPI in initialized as follows:
>
> spi = new SPI(0, true, true, false, false, false, false, true);
>
> Here is a part of my JAVA source code where I perform reading
> from the ADC:
> ...
> void convertAtoD(double samples) {
>
>                 System.out.println("Converting...");
>
>                 byte[] spidata = new byte[3];
>
>                 for(int i=0; i<3; i++)
>                 {
>                         spidata[i] = (byte) 0x00;
>                 }
>
>                 spi.xmit(spidata, 0, spidata.length);
>
>
>                 for(int i=0; i<3; i++)
>                 {
>                         System.out.print("Bitstream: ");
>                         printBinary(spidata[i]);
>                 }
>
>
>                 samples = (samp * V_MAX) / 65535.0;
>
>                 System.out.println();
>                 System.out.println(samples);
>                 System.out.println("Conversion completed.");
>
> }
>
> private static void printBinary(byte b) {
>                 for (int val = 7; val >= 0; val--) {
>                         System.out.print((b >> val) & 1);
>                 }
>
>                 System.out.println();
> }
> ...
>
> Thanks a lot!
>
> Best regards,
> Erio Magnoni.
>
> SUPSI-DTI, Manno, Switzerland
>
>
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